Friction cap for containers



Feb.2e,1929. 1,103,501 A. C. `SFAHN FRICTION CAP FOR CONTAINERS Filed Aug. 16, 1928 Patented Feb. 26,

UNITUSTATES PATENT oFFlcla..

.AUGUST C. SPAHN, OF IEITANSVILIJE,4 INDIANA, ASSIGNOR T BERNARDIN BOTTLE CA1P COMANY; OF EVANSVILLE, INDIANA, A CORPORATION OF INDIANA.

FRICTION CAP FOR CONTAINERS.

Application led August 16, 1928. Serial No. 299,947.

' The invention relates caps for closing jars and other containers, and which are adapted to be held frictionally thereon.

One object of the invention is to provide an improved cap of this type in which the skirt is provided with a substantially continuous annular bead to grip the side wall of the container and spaced arcuate grippingv surfaces to supplement'the gripping of the continuous gripping` surfaee` and cause the caps to be held securely -on the container, notwithstanding irregularities or slight variations in'form.

Another object of the invention is to provide a cap in which a sealing disk .for engaging the toprim of the container is loosely held in the cap so that it. will not puif or buckle when it is subjected to heat or moisture and which will be retained in connected '20 relation to the cap preliminary to the application of the latter to the container so thaty they need not be separately placed on the container in the sealing operationg 'Other objects of the invention will appear from the detailed description.

The invention consists in the several novel features hereinafter set forth and more particularly defined by the claims at the .conclusion hereof. -1 In the drawings Fig. 1 is an inverted plan of a cap embodying the invention. Fig. 2 is 'a section on line 2--2 of Fig. 1. Fig. 3 iS a section on line 3-3 of Fig. 1, showing the cap applied to a glass container. Fig. 4. is a sectional perspective of the cap. Fig. 5 is a section on line 5 5 of Fig. 3. Fig. 6 is a diagrammatic View illustrating the deflection of the flange of the cap before and' after it is applied to the container.` The invention is exemplified in a cap comprising a top-wall 7, which is adapted to extend over the mouth of the container and an annular skirt 8 depending from and integrally formed with thentop. The cap is .45 formed of suitable sheet i'netal so that the skirt will bev sufficiently resilient to adapt it to fit around and' conformwto the container. The sliirt comprises a cylindrical portion 10 immediately below the top, a portion immediately below the portion 10 which has an annular groove struck on a rather small radius, to form an annular substan' tially continuous inwardly projecting bead 9, and a slightly ared portion 11 below the bead 9. The lower edge .of the skirt is reverted as at 12 to 'avoid a raw edge and to stifen its lower end. The lower portion 11 of the skirt is indented or inset to form v'separated elongated arcuate surfaces 13 which are generally V-shaped in vertical section to grip the containerbelow the annular bead. The indented gripping portions 13 are lnormally positioned inwardly of the vertical plane of the inner periphery of the annular bead 9 as indicated by dotted lines in Fig. 6 so thatywhen the cap is applied to a rigid container a, these portions will be forced outwardly to insure the gripping of the container notwithstanding irregularities or slight variations in the diameters of the container. The portions of the skirt between the arcuate gripping portions 13 are preferably slightly greater in circumferential' length than said portions and this leaves th portions of the skirt between the gripping portions 13 free to contract or Hatten, as shown in Fig. 5, when the latter are expanded by the container so that the portions 13'Will'be put under tension. The arcuate gripping portions 13v will iex outwardly without tending to separate the annular bead from the container. The contraction of the skirt portions between the arcuate portions 13 tends to constrictv the portions of the bead' 9- above them and as a result the arcuate supplemental gripping surfaces will `not tend to destroy the gripping effect of theV annular bead. This construction adapts the cap for effectively gripping containers; notwithstanding the inevitable commercial variations in glass containers. In instances when the caps are used for hot packs it is necessary toxmake provision for the escape of pressure in the container during the application of the cap to the container. For this purpose the bead 9 is interrupted at 9, to provide a vent. y 1 L In practice it has been found that when disks are interposed between thetop of the cap and the mouth of the bottle, to prevent the contents of the container from contact-ing with the metal top of the cap, and to form a top seal, and are frictionally heldy therein, they must lit so tightly inthe cap that they will bulge from heat ormoi'sture because the margin of the disk is confined by the cap. This sometimes results in causing leaka e of the contents of the container around the disk; To overcome this. 'possibility the invention provides a sealing disk which is loosely fitted in the cap so that there is ample room for its expansion. An objection tothe use of a loose disk, however, is that it 'in-` creases the work in applying the cap when it is separately applied to the container. For this purpose the sealing disk 14 is loose in the cap so las to leave a slight marginal space around it or so thatyits diameter is less than that of the skirt portion 10 but greaterlthan that of the inner periphery of the bead 9. When the disk is forced into the cap beyond the bead it will be retained .in connected relation to the cap so that no separate handling of the disk is necessary in sealing the container.

The inventionexemplilies a cap, the skirtL of which is provided with an inwardly projecting bead to grip the side wall of the container and with supplemental arcuate gripping portions .below the bead; also acap in which a sealing diskis loosely fitted to permit its expansion and is held in connected relation to the cap. j f o The invention is not to be understood as restricted to the details set forth, since these may be modified within thescope of the appended claimsk without departing from the spirit and scope of the invention- Having thus described the invention, what I claim as new and desire to -secure by Letters Patent, is:

1. A friction cap for containers, comprising a top adapted to extend over the mouth of the container and an integral annular skirt of resilient material depending from the top and adapted to extend around the side-wall of the container, having an annular inwardly projecting bead with a substantially continuous surface to continuously engage and frictionally grip the side-wall of the container and having a series of indented portions, separated from one another vto form supplemental ripping surfaces.

2. A friction cap or containers, compris- P ing a top adapted to extend over the mouth of the container and an integral annular skirt of resilient material, depending from the top and adapted to extend around thel side wall of the container, having an annular inwardly projecting bead with a substantially continuous surface to continuously engage and frictionally grip the side-wallof the container and having a series of arcuate Ving a top to extend over the mouth ,contlnuously and frictionally grip the sidewall of the container and having a series of indented portions below the bead, forming supplemental gripping surfaces.

4. A cap for` application to containers, comprising a top adaptedto extend over the mouth of the container and an annular skirt of resilient material depending from the top annular substantially continuous inwardly projecting bead having a surface formed to continuously and frictionally grip the sidewall of the container and having a series of indented portions below the bead, extending inwardly of the plane of the inner periphery of the bead and forming supplemental gripping surfaces.

5. A friction cap for containers, comprising a top adapted to extend over the mouth of the container and an annular skirt of resilient material depending from the top and adapted to extend around the side-wall of the, container, having adjacent the top an annular inwardly projecting substantially continuous bead having a surface to continuously and frictionally grip the side-wall of the container and having a series of arcuate portions below the bead forming supplemental arcuate gripping surfaces, said arcuate gripping surface being of less circumferential length than the skirt-portions between them to permit the skirt portions between them to contract.

6. A friction cap for containers, comprising a `)top adapted to extend over the mouth of the container and an annular skirt of resilient material de ending from the top and adapted to extend around the side-wall of the .and adapted to extend around the side-wall 4of the container, having adjacent the top ancontainer, having adjacent the top an annular inwardly projecting substantially'continuous bead, lhaving a surface to continuously and frictional y grip the side-wall of the container and having a series of indented portions below the bead forming supplemental arcuate gripping surfaces, the bead having an interruptlon to permit the pressure in the container to escape while the cap is being applied to the container.

7. A friction cap for containers, com risin the skirt by the bead, the bead having an interruption to form a vent While the cap is being applied to the container.

Signed at Evansville, Indiana, this 10th day of August, 1928.

AUGUST C. SPAHN. 

